package com.example.book.common.shiro;

import com.example.book.domain.sys.SysUser;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.mgt.RealmSecurityManager;
import org.apache.shiro.session.Session;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.subject.SimplePrincipalCollection;
import org.apache.shiro.subject.Subject;

public class ShiroUtils {

    public static Subject getSubjct() {
        return SecurityUtils.getSubject();
    }

    public static Session getSession() {
        return SecurityUtils.getSubject().getSession();
    }

    public static void logout() {
        getSubjct().logout();
    }

    public static SysUser getUser() {
        SysUser user = (SysUser) getSubjct().getPrincipal();
        if (user != null) {
            return user;
        }
        return null;
    }

    public static void setUser(SysUser user) {
        Subject subject = getSubjct();
        PrincipalCollection principalCollection = subject.getPrincipals();
        String realmName = principalCollection.getRealmNames().iterator().next();
        PrincipalCollection newPrincipalCollection = new SimplePrincipalCollection(user, realmName);
        // 重新加载Principal
        subject.runAs(newPrincipalCollection);
    }

    public static void clearCachedAuthorizationInfo() {
        RealmSecurityManager rsm = (RealmSecurityManager) SecurityUtils.getSecurityManager();
        UserRealm realm = (UserRealm) rsm.getRealms().iterator().next();
        realm.clearCachedAuthorizationInfo();
    }

    public static String getUserId() {
        return getUser().getId();
    }

    public static String getLoginName() {
        return getUser().getLoginName();
    }

    public static String getIp() {
        return getSubjct().getSession().getHost();
    }

    public static String getSessionId() {
        return String.valueOf(getSubjct().getSession().getId());
    }
}
